What I think should be added to all plugins.

[Robert_J_Ellis]

To standardise layout, I believe that plugin form buttons should have a class. Phpbb for instance uses two classes for form button.

liteoption
and
mainoption

In a simple instance, on the bottom of a form you have clear or submit. Clear would be liteoption and submit would be mainoption.

now for textareas and text input fields call it textareafield and inputfield or something.
Anyways, that's all. It would assist designers in making better skins. CSS could then control this stuff sitewide.
Standardisation improves the quality of skin and plugin releases, I figured this was worth mentioning.